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Lego Mindstorms EV3
Intro
=====
This is the buildroot basic board support for the Lego Mindstorms EV3
programmable brick. No support for sensors and drivers is provided for the
moment.
The Lego Mindstorms EV3 brick comprises a Texas Instruments AM1808 SoC, with
an ARM 926EJ-S main processor running at 300 MHz.
See:
- https://en.wikipedia.org/wiki/Lego_Mindstorms_EV3
- http://www.lego.com/en-us/mindstorms/products/ev3/31313-mindstorms-ev3/
- http://www.ti.com/product/am1808
The buildroot configuration uses the Linux kernel of the ev3dev project.
See:
- https://github.com/ev3dev/ev3-kernel/
- http://www.ev3dev.org/
How it works
============
Boot process :
--------------
The EV3 boots from an EEPROM. This loads whatever is on the built-in 16MB flash
(usually U-Boot) and runs it. The U-Boot from the official LEGO firmware and
mainline U-Boot will attempt to boot a Linux kernel from the external µSD card.
It will try to load a uImage (and optional boot.scr) from the first µSD card
partition, which must be formatted with a FAT filesystem. If no µSD is found or
it does not contain a uImage file, then the EV3 will boot the uImage from the
built-in 16MB flash.
How to build it
===============
Configure Buildroot
-------------------
The lego_ev3_defconfig configuration provides basic support to boot on the Lego
Mindstorms EV3 programmable brick:
$ make lego_ev3_defconfig
Build everything
----------------
Note: you will need to have access to the network, since Buildroot will
download the packages' sources.
$ make
Result of the build
-------------------
After building, you should obtain this tree:
output/images/
├── boot.vfat
├── flash.bin
├── rootfs.ext2
├── rootfs.ext3 -> rootfs.ext2
├── rootfs.squashfs
├── sdcard.img
├── u-boot.bin
└── uImage
Installation
============
You can use either flash.bin or the sdcard.img. To load flash.bin, use the
official Lego Mindstorms EV3 programming software firmware update tool to load
the image. To use sdcard.img, use a disk writing tool such as Etcher or dd to
write the image to the µSD card.
Finish
======
To have a serial console, you will need a proper USB to Lego serial port
adapter plugged into the EV3 sensors port 1.
See:
- http://botbench.com/blog/2013/08/15/ev3-creating-console-cable/
- http://botbench.com/blog/2013/08/05/mindsensors-ev3-usb-console-adapter/
The serial port config to use is 115200/8-N-1.
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